<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        h1{
        /* <!--  fw 缩写 --> */
        /* <!-- bold 粗体 --> */
        /* <!-- normal 不加粗 --> */
        /* font-weight: normal; */
        /* 700 = bold */
        /* 700 = normal */
        font-weight: 700;
        }
         
    </style>
</head>
<body>
    <h1>
        
    </h1>
</body>
</html>